JP2016104118A - Infusion pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infusion pump capable of fixing an infusion tube to a prescribed position in a proper state without having deflection.SOLUTION: An infusion pump 1A includes: a tension determination mechanism 31 of detecting tension of an infusion tube 10; a pair of tube guides 80 engaged with the infusion tube 10; a door 50 sandwiching and holding the infusion tube 10 between a compression surface 21 in a closed state; and a door opening and closing mechanism 60 of opening and closing the door 50. The tube guides 80 are arranged so as to locate the engaged infusion tube 10 on the compression surface 21. The door opening and closing mechanism 60 closes the door 50 when it is determined by the tension determination mechanism 31 that tension equal to or more than prescribed tension is added to the infusion tube 10.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an infusion pump.

  Conventionally, in a general infusion therapy field, a tube portion of an infusion tube set (hereinafter referred to as an infusion tube) connected to an infusion bag or an infusion bottle is sequentially pressed by a plurality of fingers provided on a pressure surface of a pump mechanism. Peristaltic infusion pumps that perform infusion by doing so are known.

  As this type of infusion pump, in order to press the infusion tube against the pressurization surface of the main body of the infusion pump, it is described that the pressurization surface is covered with a door having an infusion tube holding member (see, for example, Patent Document 1). .)

  In such a conventional infusion pump, the operator holds the infusion tube at a predetermined position while holding the upstream portion of the infusion tube with one hand and holding the downstream portion with the other hand. Then, operate the open / close lever with one hand to close the door.

JP 2012-200902 A

  By the way, the infusion tube is sterilized in a state of being folded and packed in a packaging material.

  However, in the conventional infusion pump as described in Patent Document 1, when operating the open / close lever, the hand holding either the upstream side or the downstream side of the infusion tube is released, and It is necessary to operate the open / close lever by hand.

  Therefore, in the conventional infusion pump, when one hand is released from the infusion tube for the operation of the opening / closing lever, the infusion tube is bent by the curving hook, and the infusion tube is installed at a position away from the pressure surface. There is a risk that the infusion tube may be bent although it is installed on the pressure surface.

  When the infusion tube is installed at a position away from the pressurization surface or when the infusion tube is bent, the infusion tube is not appropriately pressurized from the pressurization surface, and the flow rate accuracy is reduced. Inconvenience such as malfunction of alarm and alarm may occur.

  This invention is made | formed in view of the above point, and it aims at providing the infusion pump which can mount | wear an infusion tube at a predetermined position in the appropriate state without bending.

  The infusion pump of the present invention is an infusion pump to which an infusion tube is attached, has a pressurizing surface, and pressurizes the infused infusion tube with the pressurizing surface to feed the liquid in the infusion tube. And a pair of tube guides provided on the upstream side and downstream side of the pressurizing surface and engaged with the infusion tube, and a tension greater than a predetermined tension at a portion located within the pressurization surface of the infusion tube attached. A tension determination mechanism that determines whether or not the fluid is added, a door that can be opened and closed, and holds the infusion tube between the pressure surface in the closed state; and a door opening and closing mechanism that closes the door. The tube guide is arranged so that the portion located between the tube guides of the infused infusion tube is located in the pressurizing surface, and the door opening / closing mechanism is in the pressurizing surface of the infused infusion tube. When the predetermined tension or tension in a portion location is added if it is determined at a tension determination mechanism, characterized in that the door is closed.

  The pair of tube guides of the infusion pump of the present invention is provided on the upstream side and the downstream side of the pressurization surface of the pump mechanism, and the portion located between the tube guides of the engaged infusion tube is located in the pressurization surface. Is arranged. Therefore, if sufficient force (tension) is applied to the engaged infusion tube to extend in the longitudinal direction, the infusion tube may be considered to be positioned within the pressure surface without any deflection. it can.

  When it is determined by the tension determination mechanism of the infusion pump according to the present invention that a sufficient tension (that is, a tension equal to or higher than a predetermined tension) is applied to the infusion tube, the door is automatically opened by the door opening / closing mechanism. Closed and the infusion tube is held between the door and the pressure surface.

  That is, in the infusion pump of the present invention, the infusion tube can be positioned in an appropriate state within the pressurizing surface by an easy operation of applying tension (pulling, etc.) to the infusion tube after engaging the infusion tube with the tube guide. it can. Further, when the state is detected, the door is automatically closed, so that it is not necessary for the operator to separate one hand from the infusion tube and close the door unlike the conventional infusion pump. Therefore, according to the infusion pump of the present invention, the infusion tube can be easily attached in an appropriate state without bending at a predetermined position.

  Further, in the infusion pump of the present invention, the tension determination mechanism includes an engaging portion that moves in accordance with a load acting from the engaged infusion tube, a detection portion that detects the position of the engaging portion, and an attached infusion solution. The tension determination unit is configured to determine whether or not a tension equal to or greater than a predetermined tension is applied to a portion located in the pressure surface of the tube. The tension determination unit has a hooking unit determined in advance by the detection unit. It may be determined that a tension equal to or higher than a predetermined tension is applied to the infusion tube when it is detected that the movement has been performed.

  Alternatively, in the infusion pump according to the present invention, the tension determination mechanism includes a load sensor that detects a load acting from the engaged infusion tube and a tension that is predetermined in a portion located within a pressure surface of the infusion tube that is attached. The tension determination unit is configured to determine whether or not the above tension is applied, and the tension determination unit is predetermined for the infusion tube when a load greater than a predetermined load is detected by the load sensor. It may be determined that a tension equal to or greater than the tension is applied.

  Further, in the infusion pump of the present invention, when the tension determination mechanism includes a load sensor and a tension determination unit, the load sensor is fixed to the fixed unit and the fixed unit at one end, and the infusion tube is connected to the other end. Based on the elastic part to be engaged, the detection part for detecting the position of the other end of the elastic part, and the position of the other end of the elastic part detected by the detection part, a load acting from the engaged infusion tube is applied. The tension determination unit is configured to apply a tension equal to or higher than a predetermined tension to a portion located in the pressurization surface of the infusion tube attached based on the load calculated by the calculation unit. You may make it determine whether it exists.

  Furthermore, in the infusion pump according to the present invention, the tension determination mechanism includes a load sensor, the load sensor is fixed to the fixing portion at one end, and the elastic portion is engaged with the infusion tube at the other end. In the case of the configuration including the load sensor, it is preferable that the load sensor has a roller with which the infused infusion tube contacts the other end of the elastic portion.

  As described above, if a roller is provided at the part where the infusion tube abuts, it is possible to eliminate the influence of friction when the tension is applied to the infusion tube, so the tension applied to the infusion tube can be calculated more accurately. be able to.

  Further, in the infusion pump of the present invention, when the tension determination mechanism includes the load sensor and the tension determination unit, the load sensor is provided on the surface of the tube guide on the side where the infusion tube is engaged and engaged. A pressure sensor that detects the pressure applied from the infusion tube, and a calculation unit that calculates a load acting from the infused infusion tube based on the pressure detected by the pressure sensor. Based on the load calculated by the calculation unit, it is preferable to determine whether or not a tension equal to or higher than a predetermined tension is applied to a portion located in the pressure surface of the infusion tube attached.

  As described above, when the tube guide originally provided in the infusion pump of the present invention is used as a part of the tension determination mechanism, the engagement member for configuring the tension determination mechanism (for example, the above-described engagement portion or fixing portion). The configuration can be simplified. As a result, the number of parts is not increased, and an increase in manufacturing cost can be suppressed.

  In the infusion pump of the present invention, the infusion pump includes a position determination mechanism for determining whether or not the infusion tube is installed in the pressurizing surface, and the door opening / closing mechanism has the infusion tube in the pressurizing surface when the door is closed. It is preferable to open the door when it is determined by the position determination mechanism that it is not installed on the door.

  Alternatively, in the infusion pump of the present invention, the position determination mechanism for determining whether or not the infusion tube is installed in the pressurization surface, and the infusion tube is not installed in the pressurization surface when the door is closed. It is preferable to include a notification mechanism that performs notification when it is determined by the position determination mechanism.

  As described above, the infusion pump of the present invention is configured so that the infusion tube is engaged with a pair of tube guides arranged on the upstream side and the downstream side of the pressurization surface of the pump mechanism, and then the tension applied to the infusion tube is applied. Based on this, it is estimated whether there is any deflection in the portion located within the pressure surface of the infusion tube attached. That is, it is estimated whether the attached infusion tube is located within the pressure surface.

  However, even when a foreign substance is sandwiched between the tube guide and the infusion tube, for example, even when a tension equal to or higher than a predetermined tension is applied to the infusion tube, the attached infusion tube remains within the pressure surface. It can also be assumed that it is not located.

  In view of this, a position determination mechanism for determining whether or not the infusion tube is installed in the pressurization surface is provided. When the infusion tube is not located in a predetermined position (in the pressurization surface), the door opening / closing mechanism is a door. If it is set as the structure which opens | releases or an alerting | reporting mechanism alert | reports, it will become possible to prevent more reliably that an infusion tube is mounted | worn in the state which is not appropriate.

  Furthermore, in the infusion pump of the present invention, in the case of a configuration including a position determination mechanism, the position determination mechanism is installed at a position adjacent to the pressurization surface in the pressurization surface or upstream or downstream of the pressurization surface. The bubble detector that detects the presence or absence of bubbles in the tube and transmits a signal, or the blockage detector that detects the presence or absence of blockage of the infusion tube and transmits the signal, and the signal from the bubble detector or the blockage detector Based on this, it is preferable that the infusion tube is configured with a position determination unit that determines whether or not the infusion tube is installed in the pressure surface.

  Usually, infusion pumps are provided with a bubble detector that detects the presence or absence of bubbles in the attached infusion tube and a blockage detector that detects whether or not the infusion tube is blocked. And those detectors do not transmit a signal when the infusion tube is not attached. Therefore, those detectors can also be used to detect the attachment of an infusion tube.

  Therefore, if the position determination mechanism is configured by using a bubble detector or a blockage detector originally provided in the infusion pump, the number of parts can be prevented from increasing, and an increase in manufacturing cost can be suppressed.

  Moreover, in the infusion pump of this invention, it is preferable to provide the door opening / closing degree detection mechanism which detects the opening / closing state of a door.

The front perspective view which shows the external appearance of the infusion pump which concerns on 1st Embodiment of this invention. The front perspective view which shows the internal structure of the infusion pump of FIG. The rear perspective view which shows the internal structure of the infusion pump of FIG. The front view which shows the internal structure of the infusion pump of FIG. 1 which abbreviate | omitted the door. FIG. 5A is a side view schematically showing a tension determination mechanism of the infusion pump of FIG. 1, FIG. 5A shows a tube unmounted state, FIG. 5B shows a tube holding state, and FIG. 5C shows a door closed state. The top view which shows typically the door automatic opening / closing mechanism and door opening / closing degree detection mechanism of the infusion pump of FIG. It is a side view which shows typically the door automatic opening / closing mechanism of the infusion pump of FIG. 1, FIG. 7A shows the case where a door is an open state, FIG. 7B shows the case where a door is a closed state. It is explanatory drawing which shows the relationship between the detection magnetic pole of the door opening-and-closing degree detection mechanism of the infusion pump of FIG. 1, and a magnetic sensor, FIG. 8A is the open state which the door opened, and FIG. 8B started the transition from the open state. FIG. 8C shows a state where the door is in the middle between the open state and the closed state, FIG. 8D shows a state where the door starts to transition to the closed state, and FIG. 8E shows a closed state where the door is closed. 9 is a graph showing the relationship between the detection state of the magnetic sensor of the infusion pump of FIG. 1 and the degree of opening and closing of the door. FIG. 9A is determined as state C, and when a predetermined time has elapsed, FIG. The case where the predetermined time has not passed is shown. The flowchart explaining the mounting method of the infusion tube to the infusion pump of FIG. The front view of the internal structure of the infusion pump which concerns on 2nd Embodiment of this invention which abbreviate | omitted the door. The front view which expands and shows the structure of one load sensor of the tension determination mechanism of the infusion pump of FIG. The front view of the internal structure of the infusion pump which concerns on 3rd Embodiment of this invention which abbreviate | omitted the door. Explanatory drawing of the calculation method of the tension | tensile_strength by the tension | tensile_strength determination mechanism of the infusion pump of FIG.

[First Embodiment]
Hereinafter, with reference to FIGS. 1-10, 1 A of infusion pumps concerning 1st Embodiment of this invention are demonstrated.

  First, a schematic configuration of an infusion pump 1A according to an embodiment of the present invention and an operation when the infusion tube 10 is attached to the infusion pump 1A will be described with reference to FIGS.

  As shown in FIG. 1, the infusion pump 1 </ b> A holds an infusion tube 10 that is a tube portion of an infusion tube set connected to an infusion bag or an infusion bottle, and has a volume such as a drug solution flowing inside the infusion tube 10. It is a medical infusion pump that performs control.

  The infusion pump 1A is a so-called horizontal infusion pump, and the portion of the infusion tube 10 held by the infusion pump 1A is substantially parallel to the placement surface of the infusion pump 1A. Hereinafter, a direction parallel to the placement surface is referred to as a “horizontal direction”.

  FIG. 2 shows a front perspective view of the internal structure of the infusion pump 1A. As shown in FIG. 2, an infusion pump 1 </ b> A includes a pump mechanism 20 that feeds the liquid in the infusion tube 10 that is attached, and an infusion tube that is provided and engaged on the upstream side and the downstream side of the pump mechanism 20. 10, a pair of tension determination mechanisms 31 for determining whether a tension equal to or higher than a predetermined tension is applied, a position determination mechanism 40 for determining whether the infusion tube 10 is installed at a predetermined position, and a pump mechanism And an openable / closable door 50 that holds the infusion tube 10 therebetween.

  FIG. 3 shows a rear perspective view of the internal structure of the infusion pump 1A. As shown in FIG. 3, the infusion pump 1 </ b> A includes a door opening / closing mechanism 60 that opens and closes the door 50 and a door opening / closing degree detection mechanism 70.

  As shown in FIG. 4, the infusion pump 1 </ b> A includes a pair of tube guides 80 provided between the pump mechanism 20 and the tension determination mechanism 31. Furthermore, the infusion pump 1 </ b> A includes a control unit (not shown) that controls the door opening / closing mechanism 60 based on signals from the tension determination mechanism 31, the position determination mechanism 40, and the door opening / closing degree detection mechanism 70.

  When attaching the infusion tube 10 to the infusion pump 1 </ b> A configured as described above, first, the operator engages the infusion tube 10 with the tube guide 80. Next, the operator engages the infusion tube 10 with the pair of tension determination mechanisms 31. Next, the operator grasps the upstream portion of the infusion tube 10 with respect to the tension determination mechanism 31 with one hand, grasps the downstream portion with the other hand, and pulls the infusion tube 10 upward ( (Move in the direction of the arrow shown in FIG. 4).

  At this time, a force (tension) to be extended in the longitudinal direction of the infusion tube 10 is applied to a portion located between the pair of tube guides 80 of the infusion tube 10. At this time, a load is applied from the infusion tube 10 to the pair of tension determination mechanisms 31 (specifically, the protrusions on the upper side of the hook portion 31b of the tension determination mechanism 31), and the hook portions 31b are moved.

  When mounting is performed according to the above procedure, in the infusion pump 1A, it is determined by the tension determination mechanism 31 whether or not a tension equal to or higher than a predetermined tension is applied to the infusion tube 10.

  As a result of the determination, when it is determined that a tension equal to or higher than a predetermined tension is applied to the infusion tube 10, the door opening / closing mechanism 60 is operated by the control unit to close the door 50, and the door 50 The infusion tube 10 is sandwiched between the pump mechanism 20 and the pump mechanism 20. At this time, when it is determined by the position determination mechanism 40 that the infusion tube 10 is installed at a predetermined position, the door 50 is closed as it is.

  After the door 50 is closed, the position determination mechanism 40 determines whether or not the infusion tube 10 is positioned within the pressure surface 21. This is because, even when a foreign substance is sandwiched between the tube guide 80 and the infusion tube 10, the attached infusion tube 10 is added even when a tension higher than a predetermined tension is applied to the infusion tube 10. It is because the case where it is not located on the pressing surface 21 can also be assumed.

  When the position determination mechanism 40 determines that the infusion tube 10 is located on the pressure surface 21, the mounting operation of the infusion tube 10 is completed.

  Next, each configuration of the infusion pump 1A will be described in detail with reference to FIGS.

  The pump mechanism 20 will be described with reference to FIG. The pump mechanism 20 has a pressurizing surface 21 that pressurizes the infusion tube 10.

  On the pressure surface 21, a plurality of fingers 22 are arranged adjacent to each other in the horizontal direction corresponding to the upstream side to the downstream side of the infusion tube 10. However, a bubble detector of a position determination mechanism 40, which will be described later, is arranged at the center of the pressing surface 21, and the fingers 22 are not arranged in that portion.

  The plurality of fingers 22 operate so as to sequentially press the mounted infusion tube 10 from the upstream side toward the downstream side by a cam mechanism (not shown).

  The pump mechanism 20 is sandwiched and held between each finger 22 of the pressurizing surface 21 and the door 50 (specifically, a holding member (not shown) provided on the body part 1a side of the infusion pump 1A of the door 50). A peristaltic motion is imparted to the infusion tube 10 by the fingers 22, and the liquid in the infusion tube 10 is sent from upstream to downstream. Therefore, the infusion pump 1A is a so-called peristaltic infusion pump.

  The tension determination mechanism 31 will be described with reference to FIGS. 2 and 5.

  As shown in FIG. 2, each of the pair of tension determination mechanisms 31 includes a hook arm 31a provided on the side surface of the main body 1a of the infusion pump 1A and a hook provided on an end of the hook arm 31a on the door 50 side. A portion 31b (engagement portion), a shaft 31c that pivotally supports the hook arm 31a with respect to the main body portion 1a, a magnet 31d fixed to an end opposite to the hook portion 31b, and a magnet 31d Based on the magnetic sensor 31e (detection unit) disposed below, a compression spring 31f that urges the hook arm 31a in a direction to return the hook arm 31a to an initial position, which will be described later, and the magnetic flux density detected by the magnetic sensor 31e, A tension determination unit (not shown) that determines whether or not a tension equal to or higher than a predetermined tension is applied;

  The infusion tube 10 is engaged with the hook portion 31b (the engagement portion). Therefore, the hook arm 31a rotates around the shaft 31c as the engaged infusion tube 10 moves (that is, according to the load acting from the infusion tube 10) (see FIG. 5).

  The magnetic sensor 31e is an analog type Hall element or a linear Hall IC. The magnetic sensor 31e detects the distance from the magnetic sensor 31e to the magnet 31d by detecting the magnetic flux density. That is, the magnetic sensor 31e indirectly detects the position of the hook portion 31b formed at the end of the hook arm 31a opposite to the end of the magnet 31d.

  In the magnet 31d and the magnetic sensor 31e, the hook portion 31b is located above the magnet 31d from a state where the hook portion 31b is located below the magnet 31d (hereinafter, this state is referred to as “forward tilted state”, see FIG. 5A). (Hereinafter, this state is referred to as a “backward tilt state”, see FIG. 5C). The magnetic flux density detected by the magnetic sensor 31e is always arranged so as to increase linearly. Yes.

  The compression spring 31f is disposed on the magnet 31d side of the shaft 31c and at a position where it can contact the lower surface side of the hook arm 31a. For this reason, when the end of the hook arm 31a on the hook portion 31b side is pulled upward (when trying to be tilted backward), the compression spring 31f abuts on the lower surface of the hook arm 31a, and the hook arm 31a On the other hand, a force in a direction to return to the initial position (to try to make it lean forward) is applied (see FIG. 5).

  In the pair of tension determination mechanisms 31 configured as described above, the hook portion 31b moves according to the load acting from the engaged infusion tube 10. Moreover, according to the tension | tensile_strength applied to the infusion tube 10, the load which acts on the hook part 31b from the infusion tube 10 increases. Therefore, it can be considered that the tension applied to the infusion tube 10 corresponds to the amount of movement of the hook portion 31b (that is, the magnetic flux density detected by the magnetic sensor 31e).

  Therefore, in the tension determination mechanism 31, the tension determination unit (not shown) is on the pressure surface 21 of the attached infusion tube 10 based on the amount of movement of the hook portion 31 b (that is, the magnetic flux density detected by the magnetic sensor 31 e). The tension applied to the portion located at is calculated, and it is determined whether or not the calculated tension is equal to or greater than a predetermined tension.

  Specifically, as shown in FIG. 5A, when the infusion tube 10 is not engaged with the hook portion 31b of the hook arm 31a or when the infusion tube 10 is engaged, no load is applied from the infusion tube 10 to the hook portion 31b. In this case, the hook arm 31a is tilted forward (hereinafter, this state is referred to as “state A”).

  This state A corresponds to the case where the infusion tube 10 is not attached or no tension is applied to the infusion tube 10. At this time, since the magnet 31d and the magnetic sensor 31e are separated from each other, the magnetic flux density detected by the magnetic sensor 31e becomes 0 or extremely low. Therefore, in the state A, the tension determination unit determines that a tension equal to or higher than a predetermined tension is not applied to the infusion tube 10.

  As shown in FIG. 5B, when the infusion tube 10 is engaged with the hook portion 31b of the hook arm 31a and the infusion tube 10 is pulled upward to some extent, the hook arm 31a is in a substantially horizontal state (hereinafter, this state is referred to as "state B"). It is said.)

  In this state B, since the magnet 31d and the magnetic sensor 31e are close to each other to some extent, the magnetic sensor 31e detects a magnetic flux density less than a predetermined threshold value α. Therefore, in the case of the state B, the tension determination unit determines that a tension equal to or higher than a predetermined tension is not applied to the infusion tube 10.

  As shown in FIG. 5C, when the infusion tube 10 is pulled further upward than in the state of FIG. 5B, the hook arm 31a is tilted backward (hereinafter, this state is referred to as “state C”).

  In this state C, since the magnet 31d and the magnetic sensor 31e are close to each other, the magnetic sensor 31e detects a magnetic flux density equal to or higher than a predetermined threshold value α. Therefore, in the state C, the tension determination unit determines that a tension equal to or higher than a predetermined tension is applied to the infusion tube 10.

  By the way, as described above, the hook arm 31a in which the hook portion 31b is formed is urged by a compression spring 31f in a direction to return to the initial position (see FIG. 5A). Therefore, the load (that is, the tension applied to the infusion tube 10) necessary to move the hook portion 31b to a position where the predetermined threshold value α of the magnetic flux density can be detected is adjusted by the spring coefficient of the compression spring 31f. .

  The tension determination mechanism 31 is not limited to the above configuration. For example, in order to detect the position of the hook part 31b (detection part) and as a detection target, not the magnetic sensor 31e and the magnet 31d but light from a photoelectric sensor and a light projection part provided with a light projection part and a light reception part are received. You may use the reflecting plate etc. which reflect toward a part.

  In addition, the infusion pump 1 </ b> A is provided with a pair of tension determination mechanisms 31 provided on the upstream side and the downstream side of the pressurizing surface 21 of the pump mechanism 20. However, only one may be provided at one of the upstream side and the downstream side, the center of the pressure surface 21, and the like.

  The position determination mechanism 40 will be described with reference to FIG. This position determination is performed even when a foreign substance is sandwiched between the tube guide 80 and the infusion tube 10 or the like, even when a tension higher than a predetermined tension is applied to the infusion tube 10. This is done because it may be assumed that no is located on the pressing surface 21.

  The position determination mechanism 40 includes a bubble detector disposed on the pressure surface 21 of the pump mechanism 20 at a position that is the horizontal center of the pressure surface 21, and a position determination unit (not shown). Yes.

  Usually, an infusion pump is equipped with a bubble detector in order to detect the presence or absence of bubbles in the infusion tube attached. Such bubble detectors generally determine the presence or absence of bubbles based on a piezoelectric speaker that generates ultrasonic waves, a microphone that receives ultrasonic waves that have passed through the detection object, and changes in the received ultrasonic waves. A bubble determination unit. The piezoelectric speaker and the microphone are composed of a piezoelectric element made of a ceramic oscillator or the like.

  When the infusion tube is attached to the infusion pump, the air bubble detector detects air bubbles in the infusion tube that is a detection target, and transmits a signal indicating the detection. Therefore, when bubbles are present in the infusion tube, a warning means provided separately warns the operator that bubbles are present.

  On the other hand, when the infusion tube is not attached, the bubble detector cannot detect air bubbles in the infusion tube as a detection target, and therefore does not transmit a signal indicating that it has been detected. That is, when the bubble detector does not transmit a signal, it can be considered that the infusion tube is not installed at a position where the bubble detector can detect.

  Therefore, in the infusion pump 1 </ b> A of the present embodiment, a bubble detector that is normally provided in the case of an infusion pump is provided at a position that is the central portion in the horizontal direction of the pressurization surface 21 of the pump mechanism 20, and the infusion tube 10 is the pressurization surface 21. It is used as a part of the position determination mechanism 40 for determining whether or not it is installed above.

  Specifically, when there is a signal from the bubble detector, a position determination unit (not shown) determines that the infusion tube 10 is installed on the pressure surface 21. On the other hand, when there is no signal, the position determination unit determines that the infusion tube 10 is not installed on the pressure surface 21.

  In the infusion pump 1A of the present embodiment, a control unit (not shown) controls the operation of the door opening / closing mechanism 60 based on the determination result by the position determination mechanism 40, and a warning means (notification mechanism) (not shown) is provided to the operator. Notification.

  The position determination mechanism 40 is not limited to the above configuration. For example, when a bubble detector is used as part of the position determination mechanism 40, a device using a laser, LED light, or the like may be used as the bubble detector, in addition to the above-described ultrasonic wave. .

  Moreover, as the position determination mechanism 40, you may use the thing using the obstruction | occlusion detector which detects the presence or absence of obstruction | occlusion of the infusion tube 10 instead of a bubble detector.

  As the blockage detector, for example, a pressure receiver that detects pressure reception, a pressing mechanism that includes a pressure spring that presses the pressure receiver against the infusion tube 10 at a predetermined pressure, and a portion where the pressure receiver of the infusion tube 10 is pressed. You may use what comprised with the receiving plate which receives the infusion tube 10 on the opposite side, and the obstruction | occlusion determination part which determines the presence or absence of obstruction | occlusion of the infusion tube 10 based on the value which the pressure receiving member detected.

  Moreover, as a position determination mechanism, you may comprise combining a bubble detector and a blockade detector.

  In addition, in the infusion pump 1A, in order to suppress an increase in the number of components, a bubble detector and a blockage detector that are usually provided in a general infusion pump are used as a part of the position determination mechanism 40. However, the position determination mechanism 40 may be configured using a sensor independent of the bubble detector or the blockage detector.

  In the present embodiment, the position determination mechanism 40 is a single sensor disposed on the pressurization surface 21 of the pump mechanism 20 at a position that is the central portion in the horizontal direction of the pressurization surface 21. It is good also as a pair of sensor arrange | positioned rather than the upstream and downstream.

  Further, the position determination mechanism 40 may be omitted. However, in that case, it is necessary to devise such that the position of the infusion tube 10 can be confirmed visually.

  Moreover, in this embodiment, although the position determination mechanism 40 is arrange | positioned in the position used as the horizontal direction center part of the pressurization surface 21 of the pump mechanism 20, it is on the pressurization surface 21 (inside the pressurization surface), and an infusion tube is installed. If it is a position where the infusion tube can be contacted, it may be arranged at a different position. For example, the pressure surface 21 may be disposed at a position that is biased upstream or downstream of the central portion in the horizontal direction, or may be located upstream or downstream of the pressure surface 21 and adjacent to the pressure surface 21. You may arrange in.

  The door 50 will be described with reference to FIG. The door 50 is a substantially rectangular plate-like member, and is pivotally supported by a shaft 51 provided on an upper end side surface so as to be rotatable with respect to the main body 1a of the infusion pump 1A. Therefore, the door 50 can be opened and closed with respect to the main body 1a of the infusion pump 1A (see FIGS. 7A and 7B).

  The door 50 has a holding member (not shown) on the surface of the infusion pump 1A on the main body 1a side, and in the closed state (see FIGS. 2 and 7B), each finger of the pressure surface 21 of the pump mechanism 20 is provided. Infusion tube 10 is sandwiched between 22 and held.

  When in the closed state, the lock shaft 52 provided on the side of the door 50 is engaged with the hook portion 31b of the hook arm 31a of the tension determination mechanism 31 with which the infusion tube 10 is engaged, and the hook portion 31b is in a predetermined state. The hook arm 31a is fixed so as to have a height. Thereby, in the closed state, the infusion tube 10 is not only sandwiched between the door 50 and the pump mechanism 20, but is also held by the hook portion 31b of the hook arm 31a.

  Note that the door 50 of the present embodiment is pivotally supported by the shaft 51 at the upper end, and has a configuration in which the lower end can be rotated to such an extent that a gap in which the infusion tube 10 can be attached (see FIG. 7A). It has become. By adopting this configuration, in the infusion pump 1A, waterproofness and dustproofness between the main body 1a and the door 50 are enhanced.

  However, the door 50 is not limited to the above configuration, and may be configured to pivotally support the door at the lower end and rotate the upper end. When the door opening / closing mechanism 60 may be large, the door 50 may be configured to rotate larger than the configuration of the above embodiment (for example, from the position shown in FIG. 7A). In such a configuration, the state of the infusion tube 10 can be easily visually observed when the infusion tube 10 is attached.

  The door opening / closing mechanism 60 will be described with reference to FIGS. 6 and 7. As shown in FIG. 6, the door opening / closing mechanism 60 includes a transmission arm 61 (see FIG. 7) having one end rotatably fixed to the side surface of the lower end of the door 50, and the other of the transmission arms 61. The cam 62 is rotatably fixed at a position eccentric from the center, is rotatable about the central axis O, a connecting shaft 63 connected to the cam 62, and the cam 62 is rotated via the connecting shaft 63. And an electric motor 64 for transmitting a driving force. The central axis O is arranged in parallel to the central axis of the shaft 51 that pivotally supports the door 50 so as to be rotatable.

  The connecting shaft 63 is disposed for the purpose of reducing a radial load caused by opening and closing of the door 50 applied to the output shaft of the electric motor 64. Therefore, if the output shaft of the electric motor 64 can sufficiently withstand this radial load, the connecting shaft 63 may be omitted.

  In the door opening / closing mechanism 60 configured as described above, the opening / closing speed of the door 50 is constant.

  As shown in FIG. 7A, when the door 50 is in the open state, the lower end of the door 50 is located farther from the main body 1a of the infusion pump 1A than the upper end. In this state, the operator performs an operation of inserting the infusion tube 10 from below between the main body 1a and the door 50 and mounting it.

  Thereafter, when the tension determination mechanism 31 determines that a tension equal to or higher than a predetermined tension is applied to the infusion tube 10, the electric motor 64 is driven by the control unit. As a result, the cam 62 is rotated by the driving force transmitted from the electric motor 64, the door 50 is closed, and the closed state as shown in FIG.

  Specifically, the cam 62 rotates by a predetermined rotation angle by the driving force from the electric motor 64, and the end of the transmission arm 61 on the cam 62 side is moved in a direction away from the door 50 than in the closed state. Thereby, the end on the door 50 side of the transmission arm 61 moves so as to approach the main body 1a of the infusion pump 1A, and the lower end of the door 50 to which the end is fixed also approaches the main body 1a. Closed.

  The door closing mechanism of the present invention is not limited to the configuration of the door opening / closing mechanism 60 described above. For example, the opening / closing speed may be changed by changing the driving force transmitted from the electric motor 64 to the cam 62 for each of the three states shown in FIG.

  Specifically, the door opening / closing mechanism 60 includes a biasing member that biases the door 50 in the closing direction, a latch that holds the door 50 in an open state, and a solenoid that holds the latch, When a tension equal to or higher than a predetermined tension is applied to the tube 10, the control unit may release the holding of the latch by the solenoid and close the door 50 by the biasing force of the spring.

  Further, the door opening / closing mechanism 60 is a mechanism that can be used when the door 50 is opened. This is because the door 50 is automatically opened when the control unit receives a signal indicating that the infusion tube 10 is not located at a predetermined position from the position determination mechanism 40. However, when such an abnormality can be notified by means provided separately, only the operation of closing the door 50 may be automatically performed, and the operation of opening the door 50 may be performed by the operator's hand.

  By the way, the electric motor 64 has no mechanical termination. Therefore, in the infusion pump 1A of this embodiment, the door open / closed degree detection mechanism 70 detects the open / closed state of the door 50, and controls the rotation direction and rotation stop of the electric motor 64.

  The door opening / closing degree detection mechanism 70 will be described with reference to FIGS. As shown in FIG. 6, the door opening / closing degree detection mechanism 70 includes a magnet sheet 71, which is a detection magnetic pole disposed on the surface of the body 62 a of the infusion pump 1 </ b> A of the cam 62 of the door opening / closing mechanism 60, And a sensor substrate 72 disposed at an opposing position. The sensor substrate 72 is provided with a first magnetic sensor 72a and a second magnetic sensor 72b (see FIG. 8B).

  The magnet sheet 71 is formed by containing a rare earth magnetic powder in a resin, and is formed by laminating a magnetic layer in which the N pole and the S pole are magnetized in half on the surface, and a support layer made of a nonmagnetic material. It is a magnetic sheet of structure. As shown in FIG. 8, the magnet sheet 71 is divided into two parts, a region magnetized in the S pole and a region magnetized in the N pole.

  The first magnetic sensor 72a and the second magnetic sensor 72b are alternating magnetic field detection type Hall ICs. The 1st magnetic sensor 72a and the 2nd magnetic sensor 72b are arrange | positioned in the state which left | separated predetermined distance in the circumferential direction.

  The door open / closed degree detection mechanism 70 configured as described above detects the open / closed degree of the door 50 as follows. 8 used in the following description is a side view of the magnet sheet 71 arranged on the cam 62 of the door opening / closing mechanism 60 as viewed from the electric motor 64 side (see FIG. 6).

  First, as shown in FIG. 8A, in the door open / closed degree detection mechanism 70, when the door 50 is opened, the first magnetic sensor 72a and the second magnetic sensor 72b both detect the S pole.

  Next, as shown in FIG. 8B, in a state where the door 50 starts to transition from the open state, the magnet sheet 71 rotates clockwise together with the cam 62, and one magnetic sensor (the first magnetic sensor 72a in this embodiment) is rotated. ) Starts to detect the N pole, but the other magnetic sensor (the second magnetic sensor 72b in this embodiment) continues to detect the S pole.

  Next, as shown in FIG. 8C, when the door 50 is in an intermediate state between the open state and the closed state, the magnet sheet 71 rotates together with the cam 62 further clockwise than in the state of FIG. 72a detects the N pole, and the second magnetic sensor 72b continues to detect the S pole.

  Next, as shown in FIG. 8D, in the state where the door 50 starts to transition to the closed state, the magnet sheet 71 and the cam 62 rotate further clockwise than in the state of FIG. 8C, and the first magnetic sensor 72a continues. The N pole is detected, and the second magnetic sensor 72b also starts to detect the N pole.

  Finally, as shown in FIG. 8E, in the closed state where the door 50 is closed, the first magnetic sensor 72a and the second magnetic sensor 72b both detect the N pole.

  Thus, in the door open / closed degree detection mechanism 70, the magnetic pole detected by the first magnetic sensor 72a and the second magnetic sensor 72b changes according to the open / closed state (open / closed degree) of the door 50. The infusion pump 1A grasps the open / closed state of the door 50 by monitoring the detected change in the magnetic pole.

  The door opening / closing degree detection mechanism 70 is not limited to the above configuration. For example, as a sensor and a detection target for detecting the degree of opening and closing, a photoelectric sensor including a light projecting unit and a light receiving unit, a reflecting plate that reflects light from the light projecting unit toward the light receiving unit, and the like may be used.

  The tube guide 80 will be described with reference to FIG. The pair of tube guides 80 of the infusion pump 1 </ b> A are provided on the upstream side and the downstream side of the pressurizing surface 21 of the pump mechanism 20, and the portion located between the tube guides 80 of the engaged infusion tube 10 is on the pressurizing surface 21. It is arranged to be located in.

  Specifically, the pair of tube guides 80 are positions adjacent to both the upstream and downstream ends of the pressurizing surface 21 of the pump mechanism 20, and the state B (hook arm 31 a) of the hook arm 31 a of the tension determination mechanism 31. Is provided so as to protrude to the door 50 side at a position lower than the position in a state substantially parallel to the mounting surface of the infusion pump 1A.

  With reference to FIG. 9, the control of the door opening / closing mechanism 60 performed by a control unit (not shown) will be described. FIG. 9 is a graph showing the relationship between the detection state of the magnetic sensor 31e of the tension determination mechanism 31 and the opening / closing degree of the door 50. The upper graphs of FIGS. 9A and 9B show the magnetic flux detected by the magnetic sensor 31e. The density is shown, and the lower graphs of FIGS. 9A and 9B show the degree of opening and closing of the door 50.

  First, as described above, the detection state of the magnetic sensor 31e is the state A in which the magnetic flux density detected by the magnetic sensor 31e becomes 0 or extremely low (the tube is not attached), and the magnetic sensor 31e has a predetermined threshold value α. It is divided into a state B (tube holding state) in which a magnetic flux density of less than 10 is detected, and a state C (door closed state) in which the magnetic sensor 31e detects a magnetic flux density equal to or higher than a predetermined threshold value α (see FIG. 5).

  At this time, as shown in FIG. 9A, when the state C is reached, the control unit determines that the infusion tube 10 is normally attached and closes the door 50. When the door 50 is normally closed, the hook arm 31a is then locked in the state B by the lock shaft 52 of the door 50. That is, when the door 50 is normally closed, the control unit performs control such that the closed state of the door 50 is maintained even if the door 50 is changed to the state B.

  On the other hand, as shown in FIG. 9B, after entering the state C, the state is changed from the state C to another state during the transition to the closed state of the door 50 due to the intentional removal of the infusion tube 10 or the like. In this case, the control unit performs control to interrupt the control for closing the door 50 in the middle and return it to the open state.

  In the infusion pump 1A, since the control unit performs the above-described control, the door 50 is prevented from being closed when the infusion tube 10 is mounted in an inappropriate state.

  The control unit also opens the door 50 when it receives a signal indicating that the infusion tube 10 is not located at the predetermined position from the position determination mechanism 40 after the operation of closing the door 50 is completed. Control to return to.

In the infusion pump 1A, as described above, the detection state of the magnetic sensor 31e is divided into three states, and a ternary type using three states (a tube not attached state, a tube holding state, and a door closed state). Although tube detection is detected by detection, binary detection using only two states (tube not mounted state, door closed state) may be employed according to the detection accuracy requirement level. With reference to the flowchart of FIG. 10, an operation for mounting the infusion tube 10 on the infusion pump 1 </ b> A and an operation for removing the infusion tube 10 from the infusion pump 1 </ b> A will be described.

  First, the operator turns on a power switch (not shown) (STEP 1: YES).

  When the power switch is turned on, the infusion pump 1A enters a standby state (STEP 2). This standby state is a state in which the infusion tube 10 can be attached, the door 50 is in an open state, and the pair of hook arms 31a is in a forward inclined state (see FIG. 5A).

  In this state, first, the operator engages the infusion tube 10 with the tube guide 80. Next, the operator engages the infusion tube 10 with the hook portion 31 b of the hook arm 31 a of the pair of tension determination mechanisms 31.

  Thereafter, the operator grasps the portion upstream of the tension determination mechanism 31 of the infusion tube 10 with one hand, and grasps the downstream portion with the other hand. Finally, the operator pulls the gripped portion of the infusion tube 10 upward. At this time, the hook portion 31 b is also moved upward by the load acting from the infusion tube 10.

  When the operator pulls the infusion tube 10 upward and the hook part 31b on the upstream side is moved to a position exceeding a predetermined position (STEP 3: YES), the tension determination mechanism 31 is moved to the downstream side. The position of the hook part 31b is determined (STEP 4).

  On the other hand, when the upstream hook portion 31b has moved only to a position not exceeding the predetermined position (STEP3: NO), the infusion pump 1A enters a standby state (STEP2).

  When the operator pulls the infusion tube 10 upward and then the hook part 31b on the downstream side is moved to a position exceeding a predetermined position (STEP 4: YES), the tension determination mechanism 31 is It determines with the tension | tensile_strength more than the predetermined tension being applied to the infusion tube 10, and transmits the signal to that effect to a control part.

  On the other hand, when the downstream hook portion 31b has moved only to a position not exceeding the predetermined position (STEP 4: NO), the infusion pump 1A enters a standby state (STEP 2).

  The control unit that has received the signal from the tension determination mechanism 31 operates the door opening / closing mechanism 60 to start the closing operation of the door 50 (STEP 5).

  Thereafter, for example, when the control unit determines that the closing operation of the door 50 is not normal due to the intentional removal of the infusion tube 10 or the like (STEP 6: NO), the control unit opens the door 50. Is started (STEP 7), and the infusion pump 1A is set in a standby state (STEP 2).

  On the other hand, when the control unit determines that the closing operation of the door 50 is normal (STEP 6: YES), the door 50 is closed (STEP 8), and the position of the infusion tube 10 is normal by the position determination mechanism 40. It is determined whether or not there is (STEP 9).

  When a signal indicating that the position of the infusion tube 10 is determined to be not normal is received from the position determination mechanism 40 (STEP 9: NO), the control unit starts the opening operation of the door 50 (STEP 7). The pump 1A is set in a standby state (STEP 2).

  On the other hand, when a signal indicating that the position of the infusion tube 10 is determined to be normal is received from the position determination mechanism 40 (STEP 9: YES), the control unit performs an operation of attaching the infusion tube 10 to the infusion pump 1A. Is notified to the operator by means of notification means or the like.

  Thereafter, when the operator presses a take-off key (not shown) (STEP 10: YES), the control unit operates the door opening / closing mechanism 60 to open the door 50 (STEP 11), and the infusion tube 10 can be removed.

  In the infusion pump 1A of the present embodiment described above, the infusion tube 10 can be positioned on the pressure surface 21 in an appropriate state by an easy operation. Further, when the state is detected, the door 50 is automatically closed, so that it is not necessary for the operator to separate one hand from the infusion tube and close the door unlike the conventional infusion pump. Therefore, according to the infusion pump 1A of the present embodiment, the infusion tube 10 can be easily mounted in an appropriate state without bending at a predetermined position.

[Second Embodiment]
Hereinafter, with reference to FIG.11 and FIG.12, the infusion pump 1B which concerns on 2nd Embodiment of this invention is demonstrated. However, since the infusion pump 1B of this embodiment is different from the infusion pump 1A of the first embodiment only in the configuration of the engagement portion of the tension determination mechanism and the infusion tube, only the configuration will be described in detail.

  As shown in FIG. 11, the pair of tension determination mechanisms 32 of the infusion pump 1 </ b> B applies a tension equal to or higher than a predetermined tension to the load sensor and a portion located on the pressure surface 21 of the infusion tube 10 attached. It is comprised with the tension | tensile_strength determination part (not shown) which determines whether it is.

  The load sensors are respectively provided at positions of a fixed portion 32a provided upstream and downstream of the pump mechanism 20, a spring 32b (elastic portion) fixed to the fixed portion 32a at one end, and the other end of the spring 32b. It comprises a magnetic sensor 32c for detecting the magnetic flux density that changes in response, a roller 32d that is provided at the other end of the spring 32b and is in contact with and in contact with the infusion tube 10, and a calculator (not shown).

  As a sensor for detecting the position of the other end of the spring 32b, another sensor such as a photoelectric sensor may be used instead of the magnetic sensor 32c.

  Further, on the upstream side and the downstream side of the tension determination mechanism 32 of the main body portion 1a of the infusion pump 1B, a hooking groove 90 for hooking the mounted infusion tube 10 is provided.

  The moving direction of the roller 32d of the tension determination mechanism 32 (that is, the direction in which the spring 32b is compressed / extended) is a direction perpendicular to the straight line connecting the tube guide 80 and the engaging groove 90.

  In the tension determination mechanism 32, the magnetic sensor 32c detects the magnetic flux density according to the position of the other end of the spring 32b. Then, a calculation part calculates the load which acts from the engaged infusion tube 10 based on the detected magnetic flux density. After that, the tension determination unit determines whether or not a tension equal to or greater than a predetermined tension is applied to the infusion tube 10 based on whether or not the calculated load is equal to or greater than a predetermined load. Determine.

  In the infusion pump 1B, when the infusion tube 10 is mounted, the operator first engages the infusion tube 10 with the tube guide 80, and then engages with the engagement groove 90 while abutting the roller 32d. Thereafter, the operator grasps the upstream portion and the downstream portion of the infusion tube 10 with respect to the tension determination mechanism 32 with both hands, and pulls the infusion tube 10 left and right.

  By this operation, a load that pushes up the roller 32d of the tension determination mechanism 32 is applied from the infusion tube 10 (in the direction in which the spring 32b is compressed). As a result, the roller 32d is pushed up toward the fixed portion 32a.

At this time, as shown in FIG. 12, the angle formed by the straight line connecting the engaging groove 90 with the tube guide 80 and the straight line connecting the engaging groove 90 and the tip of the roller 32d is α, If the angle formed by the straight line connecting the engaging groove 90 and the straight line connecting the tube guide 80 and the tip of the roller 32d is β, the force F1 acting in the direction of pushing up the roller 32d and the roller 32d of the infusion tube 10 are applied. The relationship with the tension F2 applied to the contacting portion can be expressed by the following equation.
F1 = F2sinα + F2sinβ

Furthermore, if the angle formed between the direction of the tension F2 and the straight line connecting the tip portions of the pair of tube guides 80 that contact the infusion tube 10 is θ1, the tension F2 applied to the portion of the infusion tube 10 that contacts the roller 32d The relationship with the tension F3 applied to the portion located on the pressure surface 21 of the infusion tube 10 can be expressed by the following equation.
F3 = F2 cos θ1

  From these equations, the tension F3 applied to the portion located on the pressure surface 21 of the infusion tube 10 can be obtained from the load F1 detected by the load sensor. At this time, the influence of friction is eliminated by the roller 32d.

  The same effects as the infusion pump 1A of the first embodiment can be obtained also by the infusion pump 1B of the present embodiment using the tension determination mechanism 32 as described above.

[Third Embodiment]
Hereinafter, with reference to FIG.13 and FIG.14, 1 C of infusion pumps concerning 3rd Embodiment of this invention are demonstrated. However, since the infusion pump 1C of the present embodiment is different from the infusion pump 1A of the first embodiment only in the configuration of the engagement portion of the tension determination mechanism and the infusion tube, only the configuration will be described in detail.

  As shown in FIG. 13, the pair of tension determination mechanisms 33 of the infusion pump 1 </ b> C has a tension equal to or greater than a predetermined tension at a portion positioned on the pressure surface 21 of the pair of load sensors and the infusion tube 10 attached. It is comprised with the tension | tensile_strength determination part (not shown) which determines whether it is added.

  Each of the load sensors is composed of a pressure-sensitive rubber sensor provided on a surface (lower surface) of the tube guide 80 on which the infusion tube 10 is engaged, and a calculation unit (not shown). A force sensor, a load cell, or the like may be used instead of the pressure sensitive rubber sensor.

  In addition, on the upstream side and the downstream side of the tube guide 80 (that is, the tension determination mechanism 33) of the main body 1a, a hooking groove 90 for hooking the mounted infusion tube 10 is provided.

  In the tension determination mechanism 33, the pressure-sensitive rubber sensor detects the pressure applied from the engaged infusion tube 10. Thereafter, the calculation unit calculates a load acting from the infusion tube 10 based on the detected pressure. After that, the tension determination unit determines whether or not a tension equal to or greater than a predetermined tension is applied to the infusion tube 10 based on whether or not the calculated load is equal to or greater than a predetermined load. Determine.

  In the infusion pump 1 </ b> C, when the infusion tube 10 is mounted, the operator first engages the infusion tube 10 with the tube guide 80 and then engages with the engagement groove 90. Thereafter, the operator grasps the upstream portion and the downstream portion of the infusion tube 10 with respect to the tube guide 80 with both hands, and pulls the infusion tube 10 left and right.

  By this operation, a load acts on the lower surface (that is, the pressure-sensitive rubber sensor) of the tube guide 80 (that is, the tension determination mechanism 33) from the infusion tube 10.

At this time, as shown in FIG. 14, a straight line connecting the engaging groove 90 with the tube guide 80 (that is, the direction in which the operator pulls the infusion tube 10) and the tips of the pair of tube guides 80 that contact the infusion tube 10. When the angle formed by the straight line connecting the parts is θ2, the force F4 that the operator pulls the infusion tube, the load F5 that acts on the lower surface of the tension determination mechanism 33, and the portion located on the pressure surface 21 of the infusion tube 10 The relationship with the applied tension F6 can be expressed by the following equation.
F5 = F4 cos θ2
F6 = F4sin θ2

  From these formulas, the tension F6 applied to the portion located on the pressure surface 21 of the infusion tube 10 can be obtained from the load F5 detected by the load sensor.

  The same effects as the infusion pump 1A of the first embodiment and the infusion pump 1B of the second embodiment can be obtained by the infusion pump 1C of the present embodiment using the tension determination mechanism 33 as described above. Furthermore, since the tension determination mechanism 33 is integrated with the tube guide 80, the infusion pump 1C has a simpler configuration than the infusion pump 1A of the first embodiment and the infusion pump 1B of the second embodiment, and the tension. Even if a determination mechanism is provided, the number of parts does not increase and an increase in manufacturing cost can be suppressed.

DESCRIPTION OF SYMBOLS 1A, 1B, 1C ... Infusion pump, 1a ... Main body part, 10 ... Infusion tube, 20 ... Pump mechanism, 21 ... Pressure surface, 22 ... Finger unit, 31, 32, 33 ... Tension judgment mechanism, 31a ... Hook arm (engagement) Part), 31b ... hook part, 31c ... shaft, 31d ... magnet, 31e ... magnetic sensor (detection part), 31f ... compression spring, 32a ... fixed part, 32b ... spring (elastic part), 32c ... magnetic sensor (detection part) ), 32d ... roller, 40 ... position determination mechanism, 50 ... door, 51 ... shaft, 52 ... lock shaft, 60 ... door opening / closing mechanism, 61 ... transmission arm, 62 ... cam, 63 ... coupling shaft, 64 ... electric motor, DESCRIPTION OF SYMBOLS 70 ... Door open / closed degree detection mechanism, 71 ... Magnet sheet, 72 ... Sensor board | substrate, 72a ... 1st magnetic sensor, 72b ... 2nd magnetic sensor, 80 ... Tube guide, 90 ... Hanging Groove, O ... center axis.

Claims (11)

An infusion pump to which an infusion tube is attached,
A pump mechanism having a pressurizing surface, and pressurizing the infusion tube with the pressurizing surface to feed the liquid in the infusion tube;
A pair of tube guides provided on the upstream side and the downstream side of the pressurizing surface and engaged with the infusion tube;
A tension determination mechanism that determines whether or not a tension equal to or higher than a predetermined tension is applied to a portion located in the pressure surface of the infusion tube that is mounted;
A door that can be opened and closed, and in a closed state, the infusion tube is sandwiched between the pressurizing surface and held;
A door opening and closing mechanism for closing the door,
The pair of tube guides are arranged such that a portion located between the tube guides of the infusion tube engaged is located in the pressurizing surface,
The door opening / closing mechanism opens the door when the tension determination mechanism determines that a tension equal to or higher than a predetermined tension is applied to a portion located in the pressure surface of the infusion tube mounted. An infusion pump characterized by closing. The infusion pump according to claim 1,
The tension determination mechanism includes a hooking portion that moves according to a load acting from the hooked infusion tube, a detection portion for detecting the position of the hooking portion, and the pressure surface of the infusion tube that is attached. A tension determination unit that determines whether or not a tension equal to or higher than a predetermined tension is applied to the portion located at
The tension determination unit determines that a tension equal to or greater than the predetermined tension is applied to the infusion tube when the detection unit detects that the engaging unit has moved to a predetermined position. The infusion pump according to claim 1. The infusion pump according to claim 1,
The tension determination mechanism is configured such that a load sensor that detects a load acting from the engaged infusion tube and a tension that is equal to or greater than a predetermined tension are applied to a portion of the infusion tube that is mounted and located in the pressure surface. A tension determination unit that determines whether or not
The tension determination unit determines that a tension equal to or higher than a predetermined tension is applied to the infusion tube when a load equal to or higher than a predetermined load is detected by the load sensor. Infusion pump. The infusion pump according to claim 3,
The load sensor includes a fixed part, an elastic part fixed to the fixed part at one end, and the other end of the elastic part engaged with the infusion tube, a detection part for detecting the position of the other end of the elastic part, Based on the position of the other end of the elastic part detected by the detection unit, the calculation unit is configured to calculate a load acting from the engaged infusion tube,
The tension determination unit determines whether or not a tension equal to or higher than a predetermined tension is applied to a portion located in the pressurization surface of the infusion tube mounted based on the load calculated by the calculation unit. An infusion pump characterized by that. The infusion pump according to claim 4,
The infusion pump according to claim 1, wherein the load sensor has a roller that contacts the infusion tube that is engaged with the other end of the elastic portion. The infusion pump according to claim 3,
The load sensor is provided on the surface of the tube guide on the side where the infusion tube is engaged, a pressure sensor for detecting pressure applied from the engaged infusion tube, and a pressure detected by the pressure sensor And a calculation unit that calculates the load acting from the infusion tube that has been engaged,
The tension determination unit determines whether or not a tension equal to or higher than a predetermined tension is applied to a portion located in the pressurization surface of the infusion tube mounted based on the load calculated by the calculation unit. An infusion pump characterized by that. The infusion pump according to any one of claims 1 to 6,
A position determination mechanism for determining whether or not the infusion tube is installed in the pressure surface;
The door opening / closing mechanism opens the door when the position determination mechanism determines that the infusion tube is not installed in the pressure surface when the door is closed. . The infusion pump according to any one of claims 1 to 6,
A position determination mechanism for determining whether or not the infusion tube is installed in the pressure surface;
An infusion pump comprising an informing mechanism for informing when the position judging mechanism determines that the infusion tube is not installed in the pressurizing surface when the door is closed. . The infusion pump according to claim 7 or claim 8,
The position determination mechanism is installed in a position adjacent to the pressurization surface in the pressurization surface or upstream or downstream of the pressurization surface, and detects the presence or absence of bubbles in the infusion tube to transmit a signal. An infusion pump comprising: a container; and a position determination unit that determines whether or not the infusion tube is installed in the pressurizing surface based on a signal from the bubble detector. The infusion pump according to claim 7 or claim 8,
The position determination mechanism is installed in a position adjacent to the pressurization surface in the pressurization surface or upstream or downstream of the pressurization surface, and detects a blockage of the infusion tube to transmit a signal. And a position determination unit that determines whether or not the infusion tube is installed in the pressurizing surface based on a signal from the blockage detector. The infusion pump according to any one of claims 1 to 10,
An infusion pump comprising a door open / closed degree detection mechanism for detecting an open / closed state of the door.